1001 A+B Format (20 分)难度: 简单 / 知识点: 模拟

Posted 2021-09-22 辉小歌

https://pintia.cn/problem-sets/994805342720868352/problems/994805528788582400
方法一:

#include<bits/stdc++.h>
using namespace std;
int main(void)
{
	int a,b; cin>>a>>b;
	string s=to_string(a+b);
	if(s[0]=='-') cout<<"-",s=s.substr(1);
	if(s.size()<4) cout<<s;
	else
	{
		string ans;
		for(int i=s.size()-1,j=0;i>=0;i--)
		{
			j++;
			ans+=s[i];
			if(j==3&&i) ans+=",",j=0;
		}
		reverse(ans.begin(),ans.end());
		cout<<ans;
	}
	return 0;
}

方法二:

#include<bits/stdc++.h>
using namespace std;
int main(void)
{
	int a,b; cin>>a>>b;
	string s=to_string(a+b);
	if(s[0]=='-') cout<<"-",s=s.substr(1);
	if(s.size()<4) cout<<s;
	else
	{
		reverse(s.begin(),s.end());
		for(int i=s.size()-1;i>=0;i--)
		{
			cout<<s[i];
			if(i%3==0&&i) cout<<",";
		}
	}
	return 0;
}